Abstract: Disclosed are a lens group housing, a corresponding external housing system and a camera mounting module. The lens group housing is configured to receive the lens group, a surface of the lens group housing is provided with a limiting structure configured to limit the position of the lens group housing relative to an external housing system and the surface of the lens group housing includes a thread structure configured to connect the lens group housing to the external housing system. The external housing system comprises: a limiting matching structure corresponding to the limiting structure of the lens group housing and a nut structure configured to match the thread structure of the lens group housing such that the lens group housing is fixedly connected relative to the external housing system. The camera mounting module comprises a camera module.

Abstract: A method and a system for managing voting of an alliance chain based on variable strategies are provided. The method specifically includes: 1) classifying channel strategies into an implicit strategy and a strategy based on signature; 2) specifically implementing the variable strategies: initiating, by a user, a proposal request for modifying a strategy; detecting whether a content of the strategy meets a format requirement on the condition that a target strategy is a strategy based on signature; sending a voting invitation or a signature invitation to an organization requiring auditing according to a present channel strategy or a present network strategy; voting or signing by the invited organization; analyzing a result to determine whether the result meets a requirement of the present channel strategy; if so, modifying the present channel strategy to a target channel strategy; otherwise, failing in modification.